//
//  mianTabBar.swift
//  Weibo
//
//  Created by dongpeng on 16/1/11.
//  Copyright © 2016年 dongpeng. All rights reserved.
//

import UIKit

class mianTabBar: UITabBar {

//手写代码会调用这个构造函数, 自定义入口
    
    override init(frame: CGRect) {
        super.init(frame: frame)
    
    addSubview(plusBtn)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    
    lazy var plusBtn: UIButton = {
    
    let btn = UIButton()
        
//    设置图片背景
        
       btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState:.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: .Highlighted)
    
        btn.setImage(UIImage (named: "tabbar_compose_icon_add"), forState: .Normal)
        
        btn.setImage(UIImage (named: "tabbar_compose_icon_add_highlighted"), forState: .Highlighted)
 
        btn.sizeToFit()
        
    return btn

    }()

    
//    required init?(coder aDecoder: NSCoder) {
//        //默认实现了一个报错
//        fatalError("init(coder:) has not been implemented")
//    }
    
    override func layoutSubviews() {
        
    super.layoutSubviews()
        
//   定义item 的宽高
        
    let w = self.bounds.width / 5
        
    let h = self.bounds.height
        
    let rect = CGRect (x: 0, y: 0, width: w, height: h)
        
        var index: CGFloat = 0
        
//        遍历一个字视图
        
        for subview in subviews {
            
            
            if subview.isKindOfClass(NSClassFromString("UITabBarButton")!) {
            
            
            subview.frame = CGRectOffset(rect, index * w, 0)
                
                if index == 1 {
                
                
                index++
                
                }
            index++
                
                
//                index += (index == 1 ? 2:1)
            plusBtn.frame = CGRectOffset(rect, 2 * w, 2)
                
                
                
                
            }
        }
        
        
        
        
        
        
        
        
    }

}


  